Peking University - The George Institute for Global Health, China Health Education Center, Peking University - George Institute for Global Health, Beijing Physical Examination Center, University of New South Wales (UNSW), Government of the People's Republic of China - Center of Respiratory Medicine, Nanchang University, Jiangsu Provincial Center for Disease Control and Prevention, Qingdao Center for Disease Control and Prevention, Peking University, Peking University and Queen Mary University of London - Wolfson Institute of Population Health